99' wr400 carb on a 426

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  • surveydude

Posted April 18, 2012 - 07:07 AM


Looking for some jetting advice. Has anyone rebuilt there wr400 to a 426 and rejetted the 400 carb for the additional 26cc's? Engine has 426 crank, sleeved 400 cylinder to 426 and original wr400 carb. I'm riding at an average elevation of 500' but can go as low as 0 and high as 5000' depending on direction of travel. Low humidity and summer temps of 60-115 (winter 20-60). From what i've seen on other forums, 170 main jet with a 45 pilot jet and needle on 3rd or 4th position seems about average. Has anyone been down this road already?


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